EP4237706A1 - Differential mit schmierstoffkanal - Google Patents
Differential mit schmierstoffkanalInfo
- Publication number
- EP4237706A1 EP4237706A1 EP21798606.6A EP21798606A EP4237706A1 EP 4237706 A1 EP4237706 A1 EP 4237706A1 EP 21798606 A EP21798606 A EP 21798606A EP 4237706 A1 EP4237706 A1 EP 4237706A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lubricant
- differential
- differential housing
- lubricant channel
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000000314 lubricant Substances 0.000 title claims abstract description 111
- 239000000463 material Substances 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 abstract description 10
- 238000005461 lubrication Methods 0.000 description 7
- 238000011161 development Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/048—Type of gearings to be lubricated, cooled or heated
- F16H57/0482—Gearings with gears having orbital motion
- F16H57/0483—Axle or inter-axle differentials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H48/00—Differential gearings
- F16H48/06—Differential gearings with gears having orbital motion
- F16H48/08—Differential gearings with gears having orbital motion comprising bevel gears
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H48/00—Differential gearings
- F16H48/20—Arrangements for suppressing or influencing the differential action, e.g. locking devices
- F16H48/22—Arrangements for suppressing or influencing the differential action, e.g. locking devices using friction clutches or brakes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H48/00—Differential gearings
- F16H48/38—Constructional details
- F16H48/40—Constructional details characterised by features of the rotating cases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/042—Guidance of lubricant
- F16H57/0421—Guidance of lubricant on or within the casing, e.g. shields or baffles for collecting lubricant, tubes, pipes, grooves, channels or the like
- F16H57/0424—Lubricant guiding means in the wall of or integrated with the casing, e.g. grooves, channels, holes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0467—Elements of gearings to be lubricated, cooled or heated
- F16H57/0469—Bearings or seals
- F16H57/0471—Bearing
Definitions
- the invention relates to a differential assembly with a lubricant channel for supplying lubricant to existing components.
- bearings of rotating components require constant lubrication to reduce wear and also for cooling purposes.
- bearings can be designed in encapsulated versions. These bearings are sealed and the lubricant, usually in the form of bearing grease, is placed inside the bearing beforehand. Usually the amount of lubricant depends on the intended service life and the conditions of use.
- Another variant are open bearings through which the lubricant flows.
- the lubricant can be made available by means of an oil circuit or an oil sump.
- differentials are designed in such a way that they have an outer, stationary housing and a differential mounted therein, which is supported or mounted on the stationary housing via roller bearings.
- An oil sump is usually provided in the housing, in which the rotating components are immersed and thus ensure a distribution of lubricant in order to also supply the roller bearings with lubricant.
- differentials and the housing require a stable, large structure and therefore require material and a complex internal structure, as a result of which they have a high weight. This is a hindrance, especially for use in vehicles or mobile machines.
- the lubricant is swirled and distributed by immersion in the oil sump, which increases the return time of the lubricant. Foaming occurs as a result of the immersion, causing the lubricant level to drop. For both reasons, the amount of lubricant is usually increased beyond what is necessary. This also leads to increased costs and weight in the differential.
- a differential assembly is proposed which, inter alia, solves the problems addressed.
- the present invention is a differential assembly which includes a differential case suitable for supporting at least one shaft with a gear, a rolling bearing suitable for supporting the shaft held in the differential case, a cover mounted on Differential housing is fixed, and which fixed the bearing on the differential housing, having, wherein the differential housing is designed for connection to a lubricant supply.
- a circumferential first lubrication passage is formed on one side of the rolling bearing, and between the cover and the rolling bearing, another circumferential second lubrication passage is formed on the other side of the rolling bearing, and an internal third lubrication passage is formed in the differential casing, which extends from the second Lubricant channel within a wall of the differential housing extends along to an inside of the differential housing, so that lubricant flows from the first lubricant channel through the roller bearing into the second lubricant channel and then through the third lubricant channel and enters the interior of the differential housing.
- the differential according to the invention has a lubricant circuit which flows through the roller bearing in order to then flow through a wall section of the differential housing and reach the interior of the differential.
- the formation of the wall section with the third lubricant channel makes it possible to dispense with a conventional outer housing.
- a usual oil sump is avoided and the entire structure can be realized with reduced weight.
- the rotation of the differential housing and the centrifugal force it generates aids in the distribution of the lubricant.
- the rolling bearing is subject to a continuous flow of lubricant, which avoids accumulation of abrasion while at the same time dissipating heat.
- the cover has a connection to the lubricant supply.
- the lubricant circuit is integrated into the cover, saving space. There are no further processing steps on the differential housing or the shaft.
- the cover has a fourth lubricant channel, which conducts lubricant from the connection into the first lubricant channel.
- the cover enables the lubricant to be fed to the side of the roller bearing that faces away from the cover. This avoids another channel in the shaft or in the differential housing. This reduces manufacturing complexity.
- the lubricant is impelled by the action of centrifugal force third lubricant channel moves.
- the rotation of the differential case itself uses centrifugal force to direct the lubricant toward the interior of the differential. This supports the flow of lubricant.
- the provision of an oil sump can be omitted, at the same time the differential housing can be designed with reduced wall thicknesses.
- the differential housing is designed with reduced wall thicknesses and/or openings that are suitable for reducing material.
- the construction can be designed with open wall sections, so that an open structure is present at these points.
- the differential assembly also has at least one shaft with a gear and an axle with two further gears, the gears meshing with one another and the axle and the shaft being mounted at a 90° angle to one another in the differential housing.
- the lightweight differential housing enables material savings, while the differential can be technically implemented so that it has an open structure with breakouts in the differential housing. With the help of the axle, which carries two other gears meshing with the first gear, the differential has a high power density.
- lubricant is routed to the axle from the third lubricant channel.
- the direct supply of the lubricant avoids the formation and provision of an oil sump.
- the feed takes place in the course of the lubricant supply and can be adjusted by external parameters.
- the rotation of the differential case does not create splashing losses, as is usual in an oil sump.
- foaming of the lubricant and excessive distribution are avoided, so that the amount of lubricant can be precisely measured.
- the differential assembly has a further differential housing, a second cover and a second shaft.
- the training with a second housing half allows assembly with reduced workload.
- the second shaft is used to derive torque, which is introduced into the differential with the help of the first shaft.
- the second cover can also be equipped with a lubricant channel.
- the differential housing rotates during operation, so that the lubricant in the third lubricant channel is moved by the centrifugal force that occurs.
- the rotation supports the flow in the lubricant circuit.
- the design makes an additional enclosing housing unnecessary, since a lubricant level in the lower area is no longer necessary to maintain lubrication.
- Figure 1 is an overall view of an embodiment of the invention
- Figure 2 is a sectional view of an embodiment of the invention.
- FIG. 1 shows a differential assembly 10 according to the invention.
- this consists of the differential housings 12 and 40. These enclose a differential which consists of a plurality of shafts and gears.
- the axle 34 protrudes from the inside and is held in the differential housing 12.
- a pair of covers 16 and 18 are attached to either end of the differential assembly 10 . These hold roller bearings 14 in position and press them against the differential housings 12 and 40.
- Two shafts 36, 38 extend through the covers 16, 18, which in turn provide gears in the differential. Further features are described together with FIG.
- Figure 2 shows a sectional view of the invention.
- the differential assembly 10 consists of two differential housings 12 and 40 which are symmetrical about a central axis of rotation. At both axial ends, a first and second cover 16, 18 are fixed, each fixing a roller bearing 14 to the differential housings 12, 40. At a horizontal end of the differential housing 12, this has a recess for accommodating the roller bearing 14. On a side of the roller bearing 14 facing away from the end, a step or channel is formed in the differential housing 12 that runs around the entire bearing side, in which a cavity is formed between the roller bearing 14 and the differential housing 12 is present and the first Lubricant channel 20 forms.
- the roller bearing 14 is supported with an outer ring side on the differential housing 12 and with an inner ring side on the cover 16.
- the cover 16 has a connection 44 which is connected to a lubricant supply and conveys lubricant through the cover 16 with the aid of channels into the first lubricant channel 20 .
- the lubricant comes into direct contact with the roller bearing 14 through the first lubricant channel 20 .
- Cover 16 is sealed against differential housing 12 with a seal, so that no lubricant escapes between the components.
- a second lubricant channel 22 is formed between the cover 16 and the roller bearing 14 on the side of the roller bearing 14 which faces the cover 16 . Because of the first and second lubricant channel, the lubricant can flow through the roller bearing 14 .
- the differential housing 12 expands in the axial direction to internally enclose the gear 30 and the shaft 36 connected to the gear 30 .
- the gears 32 which are fastened on an axle 34, mesh with the gear 30.
- the axle 34 is fastened in the differential housing 12 so that the gears 32 can rotate on the axle 34 with a plain bearing.
- the gears 32 mesh with another gear on a side opposite the gear 30 which is fixed to a second shaft 38 .
- Torque is introduced into the differential assembly 10 via the shaft 36, transmitted to the shaft 38 by the gears 30, 32, converted and delivered to the cover 18.
- the differential housing 12 has a third lubricant channel 24 which is located in a wall section of the second lubricant channel 22 .
- the third lubricant channel 24 can be formed one or more times on the circumference of the differential housing 12 .
- the lubricant is transported from the second lubricant channel 22 through the third lubricant channel 24 into the interior of the differential assembly 10 .
- An outlet of the third lubricant channel 24 is located on the axle 34 which has a recess in one diameter area so that the lubricant can be guided from the differential housing 12 to the surface of the axle 34 .
- the lubricant serves to lubricate the plain bearing of the gear wheels 32 which are rotatably mounted on the axle 34 .
- a multi-plate clutch is also present in the differential, with which the gears 32 can be locked so that the output speed at the cover 18 is identical to the input speed at the cover 16.
- the second cover 18 can also have a connection for supplying lubricant.
- the connection directs the lubricant to an inside of the roller bearing, corresponding to the connection in the first cover 16, and at the same time to a further opening on the inside of the differential housing 40 in order to supply the multi-plate clutch with lubricant.
- the differential housing 12 can have reinforcing ribs or thickenings on its outside in the area of the third lubricant channel 24, in which the third lubricant channel 24 is accommodated.
- the peripheral areas between the reinforcing ribs or thickenings can be designed with a smaller wall thickness, or have breakouts that are designed as openings and have no material. This allows the weight reduction to be maximized.
- Both differential housings 12, 40 can be screwed together, this allows the differential assembly 10 to be opened for maintenance purposes.
- the lubricant preferably enters the differential assembly 10 through the connection in the cover 16 and is conducted to the side of the roller bearing 14 facing away from the cover 16 . There, the lubricant is distributed through the first lubricant channel 20 on the circumference of the differential housing 12 and the roller bearing 14 and flows through the roller bearing 14 onto the side of the roller bearing 14 facing the cover 16 into the second lubricant channel 22.
- the lubricant then flows into the third lubricant channel 24, with the rotation about the longitudinal axis (axis of symmetry) of the differential assembly 10 producing a centrifugal force that supports the lubricant during transport.
- the lubricant exits the inside of the differential case 12 and flows to the axle 34 and gears 32.
- the differential assembly 10 is supplied with lubricant without using an oil sump.
- the design of the lubricant channels means that the differential housings 12, 40 do not have to have a thick wall, and the differential assembly 10 can be designed as a lightweight variant, and at the same time the lubricating function can be maintained.
- the invention enables a Saving weight in the vehicle and ensuring lubrication, this in turn results in an improved service life of the differential assembly 10, on the one hand due to the reduced wear and on the other hand due to the protection against corrosion and environmental influences. Due to the lubrication, an oil sump and splashing of the differential assembly 10 is no longer necessary, and further efficiency losses in the drive train are reduced in the process.
- the lubricant connection can be a pressure oil connection, which is supplied with lubricant under pressure by an oil pump.
- the differential assembly 10 may include at least one gear 32 on the axle 34 . It is also possible to save on the output gear and the output shaft 38 in that the differential housing 12 or 40 has external gearing for the output.
- the axle 34 can be designed to be continuous, so that it is held on two opposite sides of the differential housing 12 .
- the axle can also be formed with axle sections, so that the sections are each held individually on opposite sides of the differential housing 12 on one side.
- the differential assembly 10 can have not only two gears 32, but four gears, each of which is held on an axle section in the differential housing 12 at a 90° angle to one another. In this way, a higher torque can be supported and used.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Details Of Gearings (AREA)
- Retarders (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020128331.8A DE102020128331A1 (de) | 2020-10-28 | 2020-10-28 | Differential mit Schmierstoffkanal |
PCT/EP2021/078960 WO2022089999A1 (de) | 2020-10-28 | 2021-10-19 | Differential mit schmierstoffkanal |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4237706A1 true EP4237706A1 (de) | 2023-09-06 |
Family
ID=78402090
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21798606.6A Withdrawn EP4237706A1 (de) | 2020-10-28 | 2021-10-19 | Differential mit schmierstoffkanal |
Country Status (4)
Country | Link |
---|---|
US (1) | US11988275B2 (de) |
EP (1) | EP4237706A1 (de) |
DE (1) | DE102020128331A1 (de) |
WO (1) | WO2022089999A1 (de) |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS636530Y2 (de) | 1980-05-30 | 1988-02-24 | ||
JPH05106710A (ja) * | 1991-10-17 | 1993-04-27 | Hino Motors Ltd | 差動制限装置 |
JP2002195384A (ja) | 2000-10-19 | 2002-07-10 | Tochigi Fuji Ind Co Ltd | デファレンシャル装置 |
US8382628B2 (en) * | 2007-07-17 | 2013-02-26 | American Axle & Manufacturing, Inc. | Method and apparatus for lubricating a differential in an axle assembly |
US7892131B2 (en) | 2007-07-17 | 2011-02-22 | American Axle & Manufacturing, Inc. | Method and apparatus for lubricating a differential in an axle assembly |
JP4485566B2 (ja) | 2007-11-13 | 2010-06-23 | 本田技研工業株式会社 | モータ式動力装置 |
CN107429812A (zh) | 2015-03-27 | 2017-12-01 | 爱信艾达株式会社 | 差速器装置 |
WO2019177020A1 (ja) | 2018-03-15 | 2019-09-19 | アイシン・エィ・ダブリュ株式会社 | 車両用駆動装置 |
-
2020
- 2020-10-28 DE DE102020128331.8A patent/DE102020128331A1/de active Pending
-
2021
- 2021-10-19 EP EP21798606.6A patent/EP4237706A1/de not_active Withdrawn
- 2021-10-19 US US18/250,038 patent/US11988275B2/en active Active
- 2021-10-19 WO PCT/EP2021/078960 patent/WO2022089999A1/de active Application Filing
Also Published As
Publication number | Publication date |
---|---|
DE102020128331A1 (de) | 2022-04-28 |
US20240011553A1 (en) | 2024-01-11 |
WO2022089999A1 (de) | 2022-05-05 |
US11988275B2 (en) | 2024-05-21 |
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Legal Events
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